CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue:
Collaboration revenue - related party	$ 72	$ 1,195	$ 242	$ 1,667
Operating expenses:
Research and development (including related party expenses of $1,099 and $6,521 during the three and nine months ended September 30, 2023, respectively, and $1,600 and $4,500 during the three and nine months ended September 30, 2022, respectively)	30,385	22,119	121,208	61,577
General and administrative	20,911	8,861	62,006	25,328
Total operating expenses	51,296	30,980	183,214	86,905
Loss from operations	(51,224)	(29,785)	(182,972)	(85,238)
Other income:
Interest and other income	4,164	1,044	13,029	1,467
Interest and other expense	(600)	(164)	(931)	(318)
Other income, net	3,564	880	12,098	1,149
Net loss	$ (47,660)	$ (28,905)	$ (170,874)	$ (84,089)
Net loss per share, basic (in dollars per share)	$ (1.09)	$ (0.86)	$ (3.97)	$ (2.88)
Net loss per share, diluted (in dollars per share)	$ (1.09)	$ (0.86)	$ (3.97)	$ (2.88)
Weighted-average shares used to compute basic net loss per share (in shares)	43,654,577	33,742,076	43,057,658	29,238,247
Weighted-average shares used to compute diluted net loss per share (in shares)	43,654,577	33,742,076	43,057,658	29,238,247
Net loss	$ (47,660)	$ (28,905)	$ (170,874)	$ (84,089)
Other comprehensive gain (loss):
Change in unrealized gain (loss) on investments	109	137	326	(783)
Total other comprehensive gain (loss)	109	137	326	(783)
Total comprehensive loss	$ (47,551)	$ (28,768)	$ (170,548)	$ (84,872)